Junction seal between a liner of an underground structure and a penetrating pipe

Abstract

The apparatus is an underground structure liner based upon an inflatable liner structure. An acid resistant layer is the innermost layer of an inflatable liner, and the liner is coated with epoxy resin on its outermost surface, the surface which contacts the existing walls of the underground structure. The outermost coated surface of the liner is constructed with a fibrous fleece layer for retention of the epoxy and adhesion of the epoxy to the walls of the underground structure. An added feature of the liner is a structure which also seals the liner to pipes entering the underground structure.

What is claimed as new and for which Letters patent of the United States are desired to be secured is:  
     
       1. A method of constructing a junction between an underground structure liner and a pipe penetrating a wall of an underground structure comprising: 
       installing a cap strip of impermeable material tightly against and covering the interior surface of the pipe penetrating the wall of the underground structure, with a portion of the cap strip extending out of an end of the pipe into the underground structure and bonded to the wall of the underground structure;  
       covering the end of the pipe and the cap strip at the end of the pipe with a temporary barrier;  
       installing the underground structure liner within the underground structure and covering over the temporary barrier at the end of the pipe within the underground structure, with the liner bonded to the wall of the underground structure and to the portion of the cap strip bonded to the wall of the underground structure; and  
       removing the temporary barrier and the portion of the liner in contact with the temporary barrier from the end of the pipe.